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32. A manufacturer receives parts from two suppliers. An SRS of 400 parts from supplier 1 finds 20 defective. An SRS of 100 parts from supplier 2 finds 10 defective. Let p1 and p2 be the proportion of all parts from suppliers 1 and 2, respectively, that are defective. A 98% confidence interval for p1 – p2, the difference in the two proportions is a. -.05 ? 0.033. b. -.05 ? 0.068. c. – .05 ? 0.074.

32. A manufacturer receives parts from two suppliers. An SRS of 400 parts from supplier 1 finds 20 defective. An SRS of 100 parts from supplier 2 finds 10 defective. Let p1 and p2 be the proportion of all parts from suppliers 1 and 2, respectively, that are defective. A 98% confidence interval for p1 – p2, the difference in the two proportions is
a. -.05 ? 0.033.
b. -.05 ? 0.068.
c. – .05 ? 0.074.